热浸镀铝钢丝镀层组织结构及性能分析

对低碳钢丝连续热浸镀铝工艺及组织性能进行了分析。用不同的钢丝预热温度(T)和提升速度(W)，在保证镀层质量的前提下，得出了预热温度与提升速度的关系表达式：T=-0．31W^2 16．2W 215；SEM-EDAX分析表明，镀层由合金层和纯铝层构成，合金层主要由Fe2Al5构成；同时还对镀铝钢丝的耐腐蚀性和力学性能进行了分析，结果表明，在钢丝出口处增设冷却装置可部分恢复在热浸镀过程中造成的钢丝强度的损失。     

环链的机械镀锌

在机械镀的滚筒中,环链与料液能产生合理的流态运动,使筒内处理的环链中每个链节的滑动和转动保证了与冲击介质之间的碰撞,获得合格的机械镀锌层。经两年的生产运行证明采用机械镀锌是环链表面防护处理的一种经济可靠的方法。     

HEAT TREATMENT STRENGTHENING EFFECTS OF RARE EARTHS ON Mg—9Al ALLOY

Mg-9Al-xRE magnesium alloys were studied, where, x is 0, 0.4. 0.8. 1.2 and 1.6% (in weight percent, wt%), respectively. Influence of rare earths (RE) on microstructure and strength in both T4 (solute heat treatment) and T6 (solute heat treatment and artificial ageing treatment) were investigated. Strength of specimen was tested at ambient temperature. The micro structure was analyzed by optical microscopy, scanning electron microscopy (SEM) and X-ray diffraction analysis. RE additions improved T4 tensile strength of the treated alloys. Small addition (0.4wt%) of RE greatly improved the strength of ageing treated (T6) Mg-9Al alloy, but further additions caused decreasing.     

Indentation method for fracture resistance determination of metal/ceramic interfaces in thick TBCs

The indentation technique has been used to measure the adhesion of plasma- sprayed ceramic coatings on metals intended for thick thermal barrier coating ( TTBC) applications. This approach provides the adhesion value as the critical strain energy release rate,Gc, of the interface, which also takes into account any residual stresses. The theoretical background of the method is outlined, and specific examples are reported with respect to the effect of substrate temperature on the metal/ceramic adhesion of thick TBCs.     

SURFACE CARBURIZATION OF TiAl BASED ALLOY

ＳＵＲＦＡＣＥＣＡＲＢＵＲＩＺＡＴＩＯＮＯＦＴｉＡｌＢＡＳＥＤＡＬＬＯＹ￥Ｈｕａｎｇ，Ｂａｉｙｕｎ；Ｈｅ，Ｙｕｅｈｕｉ；Ｑｕ，Ｘｕａｎｈｕｉ；Ｋｏｎｇ，Ｇａｏｎｉｎｇ（ＰｏｗｄｅｒＭｅｔａｌｌｕｒｇｙＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅ，Ｃｅｎｔｒａｌ...     

高韧性自保护药芯焊丝

采用正交设计方法，研制出一种新氟钙钛渣系（ＣａＦ２－ＴｉＯ２－ＭｇＯ）的自保护药芯焊丝，其焊接工艺性能良好，烟雾少，并且熔敷金属组织均匀，细小，塑性和低温韧性高，是与５５０ＭＰａ级低合金高强钢相匹配的一种高效焊接材料，适于野外焊接重要结构。     

MECHANICAL PROPERTIES AND MICROSTRUCTURES OF Al-Mg-Li-Zr ALLOYS-CONTAINING SILVER

ＭＥＣＨＡＮＩＣＡＬＰＲＯＰＥＲＴＩＥＳＡＮＤＭＩＣＲＯＳＴＲＵＣＴＵＲＥＳＯＦＡｌ－Ｍｇ－Ｌｉ－ＺｒＡＬＬＯＹＳ－ＣＯＮＴＡＩＮＩＮＧＳＩＬＶＥＲ￥Ｚｈａｎｇ，Ｓｉｑｉ；Ｙｉｎ，Ｚｈｉｍｉｎ；Ｓｈｅｎ，Ｊｉａｎ；Ｌｕ，Ｂｉｎ；Ｌｉａｎｇ，Ｙｉｎｇ（...     

Dry and clean age hardening of aluminum alloys by high-pressure gas quenching

When precipitation-hardenable aluminum parts are water quenched, distortion occurs due to thermal stresses. Thereby, a costly reworking is necessary, and for this reason polymer quenchants are often used to reduce distortion, with the disadvantage that the quenched parts have to be cleaned after quenching. In opposition to liquid quenchants, gas quenching may decrease distortion due to the better temperature uniformity during quenching. Furthermore, cleaning of the quenched parts can be avoided because it is a dry process. For this purpose, a heat-treating process was evaluated that included a high-pressure gasquenching step. Gas quenching was applied to different aluminum alloys (i.e., 2024, 6013, 7075, and A357.0), and tensile tests have been carried out to determine the mechanical properties after solution annealing, gas quenching, and aging. Besides high-pressure gas quenching, alloy 2024 was quenched at ambient pressure in a gas nozzle field. The high velocity at the gas outlet leads to an accelerated cooling of the aluminum alloy in this case. Aluminum castings and forgings can be classified as an interesting field of application of these quenching methods due to their near-net shape before the heat treatment. Cost savings would be possible due to the reduced distortion, and therefore, less reworking after the precipitation hardening.     

金属塑性加工用钢的压缩力学性能及其意义

用压缩试验法测试了ＧＣｒ１５退火状态的塑性流动的应力应变曲线以及高速钢模具材料的压缩力学性能，并对其结果进行了分析讨论，同时强调了压缩力学性能指标对于金属塑性加工及模具应用的力学意义与实用价值。     

稀土硅铁对TBCs梯度热障涂层组织与性能影响的研究

通过低压等离子喷涂技术在Ni基合金表面制备了Y2O3－CeO2-TZP/NiCoCrAlY梯度热障涂层，采用光学显微镜、X射线衍射仪、扫描电镜、电子探针等方法研究了稀土硅铁对Y2O3－CeO2-TZP/NiCoCrAlY梯度热障涂层的组织和性能的影响。结果表明，在涂层中加入适量的稀土硅铁，能改善涂层的组织结构，提高其抗热震性能和抗高温氧化性能。